Can u help me come up with an experiment for chemistry that involves the topic of acid, base, salt?

You could dissociate a salt like NaCl in water to form an acid HCl and a base NaOH or something along those line. Or you could react an acid with a base to form a salt and water, for example KOH + HCl -----> KCl + HOH. The experiments could be dangerous so check with your teacher to specify which chemicals you are allowed to use.